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Eosinophils are a type of white blood cell produced in the bone marrow. They primarily provide defense against parasites and promote allergic reactions. Eosinophil percentage is the portion of eosinophils among white blood cells in a sample. (source, source)
Low serum eosinophil levels are generally considered a sign of good health.
Low eosinophil count usually does not require any specific treatment unless it is associated with a specific illness. There is no suggested nutritional, lifestyle, or supplement-based intervention.
High serum eosinophil levels can be influenced by physiological, nutritional, and environmental factors. Physiologically, eosinophils are produced in the bone marrow and are regulated by various immune signals. Nutritionally, certain dietary factors like food allergies, and allergies or exposure to environmental triggers can stimulate eosinophil production. (source, source)
Prioritize quercetin-rich foods: Quercetin has been shown to reduce serum eosinophil levels. (source) Quercetin inhibits eosinophil activation and limits their ability to accumulate at inflammatory sites. (source) Consuming quercetin-rich foods will reduce eosinophil levels. Recommendation: Eat at least one serving of quercetin-rich foods daily.
One serving examples: Kale (1 cup), Red Grapes (1 cup), Green Tea (4 fl oz), Apple (with skin) (1 medium apple), Tart Cherries (1 cup)
Prioritize sleep: Adequate sleep duration has been associated with lower eosinophil levels. (source) Sleep disturbances like apnea and asthma increase inflammation which increases eosinophil levels. (source) Recommendation: Strive to get 8 to 10 hours of sleep for optimal recovery and adaptation.
Supplement with quercetin: Quercetin has been shown to reduce serum eosinophil levels. (source) Quercetin inhibits eosinophil activation and limits their ability to accumulate at inflammatory sites. (source) Supplementing with quercetin will decrease eosinophils. Recommendation: Supplement with at least 200 mg of quercetin.
